Standing amid a throng of fellow protesters outside th Thursday morning, Young Woon Han was worried about his future son or daughter.

The Supreme Court on Thursday seemed open to lifting a series of nationwide orders blocking President Donald Trump from enforcing his birthright citizenship policy even as several of the justices wrestled with the practical implications of allowing the government to deny citizenship to people born in the US.

The justices heard arguments on whether a federal judge in a single district can block Trump administration policy across the country.